If your D2 can process everything independently, I would bet the D2 is going to probably sound the most balanced. Setting-up both options may be best to make the best decision. I'd adjust each for room correction, and listen for an extended time (at least a weekend for each) while adjusting EQ, delay, sub, etc. Repeat soundtracks between systems and evaluate all functions - disks, tuners, etc.
Have a couple friends with critical ears listen, too.
Have a couple friends with critical ears listen, too.